The setting time of ZnPO4 cement can be retarded by_____________?
Correct answer: C. slower addition of powder to liquid
- A. mixing more powder to the liquid
- B. mixing powder to liquid, checked by water
- C. slower addition of powder to liquid
- D. faster addition of powder to liquid
Explanation
Slow addition of powder to zinc phosphate cement allows more heat to dissipate and delays the acid-base reaction, increasing working and setting time. Rapid powder addition or adding more powder generally shortens the setting time.
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